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QUESTION: I am Type AB. In ER4YT coffee is listed as Highly Beneficial. In LY4YT it is listed as Avoid. This is a significant difference! Please let me know which is correct.
ANSWER: Both values are 'correct' although the LR4YT value is perhaps 'more correct.'
In ER4YT coffee was rated beneficial because it contains a few enzymes which can help de-antigenate 'A-like' molecules so as to make the type A (and A immune systems function a bit more efficiently.
Whereas this continues to be true for type A, newer evidence suggests that this function is not as important for type AB as it is for type A. Rather, as we saw in a recent ASK DR. D'ADAMO, type AB's need to optimize their Natural Killer Cell (NK cell) activity in preference to their ability to discriminate blood type antigens. With this respect, high levels of caffeine are known to depress NK cells cytotoxicity, so value was adjusted in light of LR4YT's newer Tier system (Coffee Avoidance is a Tier II avoid, which is not as NASA might say 'mission critical.'
In essence, if you are not powering your life by caffeine, to the point where your stress levels are eroding you NK cell activity, a bit of coffee will not be fatal.